Ferrocenyl hetaryl thioketones react smoothly with in situ generated thiocarbonyl S-methanides to give 1,3-dithiolanes. In the case of aromatic S-methanides, the sterically more crowded 4,4,5,5-tetrasubstituted 1,3-dithiolanes (2-CH2 isomers) were formed as sole products. The reactions with cycloaliphatic S-methanides led to mixtures of 2-CH2 and 5-CH2 isomers with the major component being the sterically
                                    二茂铁基杂芳基
硫代酮与原位生成的
硫代羰基S-
甲烷化物平稳反应,生成1,3-二
硫代戊环。在芳族S-甲酰胺的情况下,形成空间上更拥挤的4,4,5,5-四取代的1,3-二
硫杂
环戊烷(2-
CH2异构体)作为唯一产品。与脂环族S-甲酰胺的反应导致2-   和5-   异构体的混合物,主要成分是在空间上更拥挤的2-   异构体。后一种产物的优选形成是通过以下假设来解释的:通过稳定的1,5-双自由基为关键中间体,通过逐步反应机理形成了正式的[3 + 2]-环加合物。